*{
	margin: 0;
	padding: 0;
	list-style: none;
	text-decoration: none;
}
.container{
	position: absolute;
	width: 660px;
	height: 370px;
	border: 4px solid #000;
	top: 0;
	left: 0;
	right: 0;
	bottom: 0;
	margin: auto;
	overflow: hidden;
}
.main{
	position: absolute;
	left: -660px;
	width: 700%;
	font-size: 0;
}
.list{
	position: absolute;
	bottom: 20px;
	left: 50%;
	margin-left: -54.47px;
	cursor: pointer;
}
.list li{
	
	display: inline-block;
	width: 18px;
	height: 18px;
	border-radius: 50%;
	background-color: #ccc;
}
.list .active{
	background-color: red;
}
.btn{
	display: none;
	position: absolute;
	top: 50%;
	margin-top: -20px;
	width: 40px;
	height: 40px;
	color: #fff;
	background-color: rgba(0,0,0,0.3);
	line-height: 40px;
	text-align: center;
	font-weight: bold;
	font-size: 20px;
}
#next{
	right: 0;
}
#prev{
	left: 0;
}
.container:hover .btn{
	display: block;
	
}